19806113 has 4 divisors (see below), whose sum is σ = 20848560. Its totient is φ = 18763668.

The previous prime is 19806109. The next prime is 19806119. The reversal of 19806113 is 31160891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19806113 - 2² = 19806109 is a prime.

It is a super-2 number, since 2×19806113² = 784564224337538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19806119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521195 + ... + 521232.

It is an arithmetic number, because the mean of its divisors is an integer number (5212140).

Almost surely, 2^19806113 is an apocalyptic number.

It is an amenable number.

19806113 is a deficient number, since it is larger than the sum of its proper divisors (1042447).

19806113 is a wasteful number, since it uses less digits than its factorization.

19806113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042446.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 19806113 is about 4450.4059365411. The cubic root of 19806113 is about 270.5617613458.

The spelling of 19806113 in words is "nineteen million, eight hundred six thousand, one hundred thirteen".